HP 83751A Programming Manual page 156

Programming Commands
Power
Subsystem
POWer[:LEVel]
Sets and queries the output level. Default units (and units for query
response) are determined by UNIT:POWer. MAXimum and MINimum levels
refer to the leveling mode at the time the command is sent. For instance:
will have different effects than
*RST value is 0 dBm.
POWer:MODE F'IXedlSWEep
Sets and queries the setting of the power sweep mode switch. If POWMODE
and SPAN functions. If POW:MODE is FIX then the output is controlled by
*RST value is FIXed.
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suffix] IMAXimumlMINimum~UPlDOWN